OUTLINE: This is a randomized, double-blind, placebo-controlled study. Patients are stratified according to site of most recent lesion resection that rendered no evidence of disease (lung vs liver with no more than 3 lesions vs liver with more than 3 lesions vs lung and liver vs all other sites[including sites that were both resected and ablated]). Patients without evidence of residual disease are randomized to one of two treatment arms.